A piece of copper and other of germanium are cooled from

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A piece of copper and other of germanium are cooled from the room temperature to 80 K, then

1. resistance of each will increase
2. resistance of copper will decrease
3. resistance of copper will increase while that of germanium will decrease
4. resistance of copper will decrease while that of germanium will increase

Correct Option: D

Copper is a conductor, so, its resistance decreases on decreasing temperature as thermal agitation decreases whereas germanium is semiconductor, therefore, on decreasing temperature resistance increases.